Panasonic Lumix DMC-FS8 Operating Instructions Manual page 47

Advanced (Recording pictures)
∫ Recording guide line
When you align the subject on the horizontal and vertical guide lines
or the cross point of these lines, you can take pictures with
well-designed composition by viewing the size, the slope and the
balance of the subject.
This is used when dividing the entire screen into 3k3 for taking
pictures with a well-balanced composition.
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